The baby of Shamima Begum, a British-born teenager who fled London to join the IS, has died in Syria.
The death has been confirmed by the US-backed Syrian Democratic Forces, who declined to specify how or when it happened.
According to the medical certificates obtained by the BBC, the three-week-old boy died of pneumonia.
Shamima, who was stripped of her UK citizenship despite her wish to return, had previously lost two other children, apparently from illness and malnutrition.

Fire disrupts COP30 climate talks as UN chief urges deal
Zelenskyy ready for 'honest' work on US-backed plan as Europeans push back
White House defends Trump calling a female reporter 'piggy'
Death toll rises in central Vietnam flooding, more heavy rain forecast
Four more arrested in India over deadly Delhi blast